Synthesis and evaluation of optical and antimicrobial properties of Ag-SnO 2 nanocomposites

Nair, Kishore Kumar; Kumar, Promod; Kumar, Vinod; Harris, Richard Anthony; Kroon, R.E.; Viljoen, Bennie C.; Shumbula, Poslet; Mlambo, Mbuso; Swart, H.C.

doi:10.1016/j.physb.2017.08.028

Cited by 22 publications

(15 citation statements)

References 31 publications

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“…They attributed that to the mechanism typical for metal oxides, i.e., formation of reactive oxygen species and electrostatic interaction of nanostructures with bacterial cell walls. Furthermore, Kumar Nair et al [75] reported a synergic antimicrobial action of Ag and SnO 2 towards E. coli . However, the authors applied UV irradiation to induce the antibacterial action.…”

Section: Resultsmentioning

confidence: 99%

Influence of Preparation Procedure on Physicochemical and Antibacterial Properties of Titanate Nanotubes Modified with Silver

et al. 2019

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Silver nanoparticles (NPs) are effective antibacterial agents; however, aggregation of NPs and uncontrolled release of Ag+ affect their efficiency and may pose a risk to the environment. To overcome these disadvantages, immobilization of Ag onto titanate nanotubes (TNTs) was investigated. This paper describes the physicochemical and antibacterial properties of silver incorporated titanate nanotubes (Ag/TNTs) prepared using five procedures and containing different Ag amounts (0.11–30.85 wt.%). The methods were (i) sol-gel followed by a hydrothermal process; (ii) photodeposition under ambient conditions; (iii) photodeposition under an inert atmosphere; (iv) NaBH4 reduction; and (v) electroless deposition after activation of TNTs with Sn2+. Depending on the synthesis procedure, the presence of metallic Ag NPs, AgO or AgCl was observed. The electroless method led to an additional deposition of SnO2 NPs. The antibacterial properties of Ag/TNTs were analyzed as a function of Ag content and released against Escherichia coli and Staphylococcus epidermidis. The best bactericidal properties exhibited Ag/TNTs prepared through the photodeposition process due to the higher interaction of exposed Ag NPs with bacteria. An increase of Ag loading resulted in improvement of antibacterial activity of Ag/TNTs although no direct correlation between silver content or release and inhibition of bacterial growth was found.

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Section: Resultsmentioning

confidence: 99%

Influence of Preparation Procedure on Physicochemical and Antibacterial Properties of Titanate Nanotubes Modified with Silver

et al. 2019

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“…In the wound healing process, growth factors play an important role by stimulating inflammatory response, angiogenesis, granulation of tissue, and modelling. It is well established that in a diabetic wound, the availability of growth factors will decrease due to the pathophysiology [74,75]. External administration of growth factors can be given, but proteases present in the wound bed can easily degrade these growth factors physiologically.…”

Section: Growth Factorsmentioning

confidence: 99%

“…The octahedron shares two, three, and four edges with adjacent octahedra to give rutile, brookite and anatase, respectively [42]. Anatase and brookite are metastable, and transform irreversibly to a stable rutile phase by heating at 500-700 • C. Moreover, anion fluorine dopant also stabilizes anatase at elevated temperatures (>1000 • C) [75]. Generally, anatase TiO 2 is more photoactive than rutile and brookite.…”

Section: Crystal Structure Of Titaniamentioning

confidence: 99%

“…From the literature, fluorine doping stabilizes anatase TiO 2 at elevated temperatures up to 1200 • C [75]. The substitution of fluorine for oxygen in TiO 2 NPs leads to the creation of an oxygen vacancy [175].…”

Section: Non-metal Dopingmentioning

confidence: 99%

“…The nanofibers heated in 100% argon exhibit an uneven or rough surface in comparison with the as-spun amorphous fibers due to the formation of crystalline grains of anatase and rutile (Figure 15a,b). In general, the anatase phase is stable in TiO 2 up to 500-700 • C, and transforms to rutile with an increase in temperature [75]. Calcination at 900 • C led to a reduction in the diameter of NFs due to the removal of PVP and the densification of TiO 2 .…”

Section: Electrospinningmentioning

confidence: 99%

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